Question 17. When you come to (A) Brazil, you should tip (B) the waiter 10% for (C) the bill (D).
Question 18. When eating (A) in India, you always should (B) use the (C) right hand. Never use (D) the left hand.
Question 19. On my family (A), children have to (B) get permission (C) before leaving (D) the dining table.
Question 20. When (A) we were young, we have to (B) stand in a row (C) to greet the guests (D) .
Question 21. People have followed (A) the tradition of (B) give (C) lucky money on Tet for (D) a long time.